Looks like a feeder may have bit him when he was fed last. He could have also rubbed it while shedding, but to me it looks more like a rodent bite. A bit of neosporin and patience and it'll be fine.
I highly suggest picking up some Provent a Mite to treat your enclosure(s) - even for the snake that isn't showing mites right now, they move far and they move fast, and it's way easier to prevent them than it is to try and get rid of them. I can almost guarantee if you saw a bunch of mites floating in after the first snake was soaked, your other cages have mites that have laid eggs in them already, and you just aren't seeing the adults yet.
This article is how we suggest dealing with mites, and when you're diligent about treating each week, you should be able to get rid of them and never see them again.
-Jen
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